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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34a4ac79e92a0fa36fe0fff921495d006bfdba483b7456467d4c9e793fe8bc2f' 
  AND token = 'JlfZJn4F88sGHv13V+tHtURKOh9w4K3Px3ycRydcnqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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