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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76efce915952a5b0f59fb34054deca5fb92342e4f00fb2be9beb26d4978cee1a' 
  AND token = 'sqLxXkzRdg7MTjeyKdSBgNOCSCkJ5yOlIZdn1SJwYkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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