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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f2192891881c224642098c46d6b1a21b7f465cb53c05fcbe9ee2b63818f5f64' 
  AND token = 'AO8kexZzq713fpnZgzZ9NkV8z68b+D6c6IEFmO/ysvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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