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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ce3a1f6d51979dde59da09fc92e3705dc5d2b870399b81e00d7a2affe6b4a7e' 
  AND token = 'JRE3g2qAbTRisTdsqk0HEmYhKgkkYG94IIA0ucqAeUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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