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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2413ba9b24970209db7b77e887330dc9f30654026e7d1968c48ab7700e4659a2' 
  AND token = '6qt9l82Yx0rhOrqGntMmmYUNwgSOao1uSryp61TK1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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