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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb3c5a7568dfe40628bb1e1a96fd698f1bc9e231958fa8d7def986a3e6ec337' 
  AND token = 'aLZkmVEWVkkJPRLDZLBHmAssr9lV8H0t/xA+qt15Qh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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