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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6ab3b7a5abef90f86741a762e9bd3aef357ea38e5542c4e8d1a25672d45b1df' 
  AND token = 'FdDnJwE65l06odHeI/8SnFjpkzRLdm//IueTz1saqIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}