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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba6e54ca9af5e9b44aea46681c58572b8f42ed7fb911fdb1dae9e38743036aab' 
  AND token = 'lZll3mPddNrijUecHinqi/8cUrK8LlH11//o0cCkkbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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