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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07418971c4ee35a23087a2ce56eaf85801c96a0bf8b2d28e0abad0353668a595' 
  AND token = '5icu5LZC31BA3uopJApAEbPEk3pi90jAHzwVz9vJlVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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