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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '191e1d1f9039eb40f5a7fe29aea2a82e23bb88d2f03594b72ec99d66985df9cf' 
  AND token = 'GHYwpxTXrrTpJP2dzZppy4B6G3KbNjKrpPOzSc813ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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