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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c7ce564e0c7f9312ad0e488fd8282316d7f88ebf4170afea5b7bb571324e137' 
  AND token = 'PSYJN9DWl2lSIFj8hD0Roxyav4tOZP/MeesH592hTIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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