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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a80975d97a3b2b78ef5548eb04cc6609b10aee8fc86ec6999c4ecdac0913cd7' 
  AND token = '0I7dgg+2Ql4cg/LcaUusdbEvtg7RX0q9aAU5OmnEbgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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