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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba2886fd74caa7efbb6442d52772728f23ebee3112a4fe840fe05d7d2e51d556' 
  AND token = 'IrLuHP4lXddJ+dmNhQjIHqQ6o9opu8Bf1/9owhH/f38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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