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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3317d20f28f8b7230e12fdf3a329e114c292f4e2a000b8fcbda409b364f0c89c' 
  AND token = '+H3kSySkHmmo0GMT6oHZk3NDCTdrJX5cYuNtxqNq9+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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