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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45649044ac989a2793f1ddaa0f0846031e99c8cb47ca02c2328b42099f9f0a53' 
  AND token = 'I69I/10uMZaskOHLpAbZB4CjHXCgeTY8F2KI7SnlFMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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