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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71e2dbef7cb5de0b0a8a608fe0e75949dea458e8a7837fce1b44bbbaa588193c' 
  AND token = 'qJRUe8A2Epj2nlEV+rVT1zTFT+MUKPjth7fzudpj55Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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