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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '911a8b6d0e915f6f9f0c6b1dbbbd9ff171bc9d4b4cf5e2eb46d2133c5f1e6fe8' 
  AND token = '1aCncQCx4XnCAc+y51FmdBSNVQizvo+EQkibeJcAmNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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