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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '872cc5d4899af3cd1f8f0f046235c596c4c3d03bf380a2c72e87e9c007c5c914' 
  AND token = 'xP8uXNXX/WU0CWV1QuH1GyC0RbPsUzzV+19Bvfk9Jko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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