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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '140b84b5311049932ace3437af24a7a0ad186ca0d686f1f5487e1248d4cdf11d' 
  AND token = 'ECJSWo3l10NtI+xjmQ6327lPV8Z073R7ijSRBxG4cmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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