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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40a84943b265632263660541325672de2666a4748ccbd48f42d139fd2a93d285' 
  AND token = 'yMT92oB7oUWrOE76N+gm5KsxOKImeB+Vju1mMTLMgAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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