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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '478539f0ee84a3417fc8995d7f3883867875c14d40bb9473ef7d0c486e427ec5' 
  AND token = 'pMr4uwIX58ScP5kynzITbvBMxAodj7R91j+rsLlcMjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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