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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e137d10106b112baa920288f7d8e5afa60606e550ccbaee7c5b15dacd5dc00b' 
  AND token = 'lq9J2IUJjWsiWDQlmLfitl6SoCDDF6K4m18yLCJ23jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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