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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '344bfa8bad331aee573090bfc0534ce84f1d16061837528c6ba6874a0441bf45' 
  AND token = 'wTSUE96jlrDFhysKQ0lHb3gKv7e2SGwXgdko+SbwwX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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