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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ebfc4ea5071f5cdefacdbdbce75fe64f4bf414ea620687058d7b5e7be8bef53' 
  AND token = 't/UXHzT1xUyacwak8SNwaLo9XIyEA0HUL9bJa7t1fpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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