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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e7257070ef1a7135ec23ae394ca94a16f4721ff9d120a24825562594a72f7cf' 
  AND token = 'RGYHG1twG/in6WnC1FOE/s8B00kuFQeE/7+oKjpICkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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