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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12872e59818d943f1dd7389269d61eebb853c6c477c516034bbbb9a6523a14d8' 
  AND token = 'MkPSp7s3dN2S19knp8gPIAA+fIXssPwsi1usTXXtt4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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