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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a954392b230650d219e2f1cabcdafd8c3b7833bc4c4a1b22b56a7e6ec4576edc' 
  AND token = 'm926v/lxrKxmxAO85+26sS4g41Q2oREB/BZwO6+iuc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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