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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82d17613efb6584c5a399e07918ee2ff1b3d41594c3f6e59464d47108b50567d' 
  AND token = 'yEWGMLzAHLD/GlMGf9rhsKdkA512iTzJcMacGC+1bi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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