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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '974abe0b6c207ff7ef0fdc0bd2f096dc9448cdc7736e7135cbb3b84d226e97c1' 
  AND token = 'DnIXBuNOuqrzvcLHfDS5XGROQ4CEma1Dt7HpNTkfPTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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