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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c440f9265d0aca82a4da2e973080eb58b493357b3c1fa4709674be885080bd2c' 
  AND token = 'GAC3MPLJ1IQIFquAtEEC4vXJr3V0XP7OBrcE3RL9mSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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