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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7e9ed2882706f3afa52f3faf9a93f6c05448886dbb14542cd205f801ca32c3d' 
  AND token = 'RM9kVD6NKi53ogZ2QWdOg22ZZrvGL9wVnVWIZ8S6O6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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