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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ce05af7a9def9784e5144a93b82a1c75db56eb528d649665ddf44352626e82a' 
  AND token = 'fHP6U4eF3HLMu2tjqH2+AMrtHgyCZ8E4lZQSsWFBp7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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