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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99c6eb93eff6569891382a39e90d49fb74f66dea9c4a445440ac83678d6f3af4' 
  AND token = '4FpqA5rg27zSOdD0cbvXs+TWdCfD9WTYPnao191woXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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