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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac0df9c6f599117f86d516ae9d419c7fe774aff07ab9630423891fe811f812e1' 
  AND token = '2uM38J+CW6xBmlFFFVyYaTGD2DOWDQMGaztb52SGXqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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