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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fb358e1b7421548a808dce28c6b82b524b2d95c1507271dd05a06199e3a3d6b' 
  AND token = 'TwI6leSrYOBNPIMOOaXazJhl4hhI8FzYo0+RXNcqfiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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