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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be128ab2b3e1918a6a04e2f3a74c44190aecd673b7fe33dd6782a329db672a74' 
  AND token = 'zeD5E1jXgUfVoZ3GKvtDcPJcERpI2sHAmdr1i5/SdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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