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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '911ae34889d880d0605a76373f905605dc2258e09af847c0495aaf4577cf8cc7' 
  AND token = 'u6fp/R57ZcsYa2+upGlhpA7AqxhiyOVHhDqJPO/of1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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