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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1acbda1d5ac03b4103b5cdf8d92efb317b960dec7efb51a4d41ce12552022c96' 
  AND token = 'vIZS6WSn3YIv2LaE2F5BPT2suOMVVmxCuB1BiPqFlnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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