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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d337c693295b3b33318fbec831409e200813b1771c670fa91183ae5ba39eb3' 
  AND token = '8focKn/qkQBrBQ5tZB5mIVWWilp3XHA7Fc3koC06fZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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