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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b87cadb25595e6aaca4c52939a26a4eeb09cbf9835922443abb88ba0e39886ae' 
  AND token = '3vhL/IX/GzeiuKUYxuyhuen/OTHbJQYsUCZldhiaQfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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