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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ef3cf9f19be6729fce6f504e54dc000280aac31a0cefd84e86a6334c7d97bda' 
  AND token = 'uYd/joHxkN1LJv08HfLkCZqU8lLlY1BmpTs1InYlIzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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