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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2195ada5153a5ef57973e338cebefdcf697405830d8541274bcb6ea544d39a49' 
  AND token = 'lostDHt4A9NZsk12/zSCcJt5bQa9Qguj9qtOBuHsP6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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