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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fa6a082bb835d30c958ed8220333ca60372b243fa63c69c448d2c140a1ade42' 
  AND token = 'v98vbw3XSG1ksjgSCW9wLOdcdxy3Jsr4nQ/+NEjS8iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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