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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e07eb13ce456094a82431854dde10c03401699817ea12c3f70a418b688f38903' 
  AND token = '2W4+/viSHCJwRHuxUbv/0C6laiLJ5ZDid7V9tioSYdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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