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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983b53a22a751d0ad1f41280bd076a3ea7fcac0d542f31deea9a059f1d4e37ae' 
  AND token = 'cMcM1qz+Kk8KRpsbSARZZlRW21n1s3FvCzhBtpjCIDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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