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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4157c1619970800d29ebfad441dccb5f95b4d85c4231db34a75bbeba48c8eb59' 
  AND token = '7UbdbmP5s8jD1op6YYHK4gU/1oc66XNt8/aSpRYp28g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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