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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0f05b615990520617e24bd69d4e7b21037e26beb1d49ab09fc478407ad8edfc' 
  AND token = '5eFEItUrGy9YY0Y1v+KxA4cGlVDgybAXxh8CDeW4CEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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