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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '758be6bd16dc121e5bbb03ca780216e06be9452985f36b959250af87d97a2862' 
  AND token = 'Fa10mS1ppscu1JuFSJrE7LXQqwxAFi2cVgxYOOB1faI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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