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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd40656816eca2bb0ac491df0b32e2275877f97d065973d9b622d6173e1182670' 
  AND token = 'cRKmzw4O0VE4oSKpooNVxQB89Dt1bzNouJ/fOeSB0/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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