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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '046d1cafea7fdb145f09e20352ab0f82e1b08f97434c651f4b85faaa29f0e2f1' 
  AND token = 'WdTR2U+zsw4tKRLjRps8Ac6muM0Xz+q00mt6jyAT3l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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