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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd794d508e52d0a7902572a0c81f8e7b943250e92ea12a74bd990e251e841ab70' 
  AND token = 'u2zOKURyExb8MGBUOqb7648joNiNerak/UgEV7Hu66E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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