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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a98abbe9aca05b8b7aa635ed87afcc168146413be9a509e77c8085a94f2e3d5a' 
  AND token = 'HYGCzlSCZfUIq+J40kjaI4FLSRi5b44kw9HBwpqxawM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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