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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a40614ffbaef11067989cc44bdfe7f90f607d974e02846816bba334acec87fa' 
  AND token = '7AD2nQ0OEnCVo6fIL6hWqt/6fwzW1VmmE2lQiGB1uyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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