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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '522a5c26676c0e3e09393e0111220a9d3aad05aa2b9ebf1c3ad4ae21becf0fb9' 
  AND token = 'TOJfEmilgmgXKzOIdX/ecN0mo2V904qfDDVK8JwQeJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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