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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbe6e31a2b5c1d614bb2bff64e920afcfa40ac0f9d6d50cba4510f3e4d1de355' 
  AND token = 'pDg0Nkd5x4pPyRq8i5tYmu57ezv9g+vL0dlVfzVgiiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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