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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b02f22f56fe882bed120ff6ea94f6f7a04ea95c2c37de89b5db9b4f53a8a527' 
  AND token = '2id5d40IWtdQNz9d4SI1QraODwaLsQ6QFPJWR++EjhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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